Heracleitus or Heraclitus may refer to:

• Heraclitus of Ephesus, pre-Socratic Ionian philosopher
• Heraclitus (commentator) (Heraclitus Homericus), commentator on Homer
• Heraclitus of Sicyon, author on stones
• Heraclitus of Tyre, friend of Antiochus
• Heraclitus the Paradoxographer, rationalizing author on Greek mythology
• Heraclitus the Peripatetic

• Heraclitus (comic poet)
• Heraclitus (lyric poet)
• Heraclitus of Halicarnassus, elegiac poet

• Heraclitus of Macedon, winner in stadion Lykaia 304 BC^[1]
• Heraclitus of Samos, winner in stadion Olympics 208 BC^[2]

• Heraclitus of Cyme in Aeolis, governor of Heraclea appointed by Arsinoe II
• Heraclitus of Lesbos, historian on Macedon
• Heraclitus of Tarentum, harpist of Alexander
• Heraclitus (bishop), 2nd-century Christian bishop
• "Heraclitus", poem by William Johnson Cory, modelled on a poem by Callimachus
• Heraclitus (crater), a complex lunar impact crater in the rugged southern highlands of the Moon
• Heraclitus (modeling infrastructure), an approach for modeling computer-integrated systems
• Heraclitus (ship), a vessel built by Institute of Ecotechnics as one of several prequels to Project Biosphere 2

• Dictionary of Greek and Roman Biography and Mythology
• Heracleitus, AncientLibrary.com^[usurped]